Normal distribution.

An orange juice producer buys all his oranges from a large orange orchard. The amount of juice squeezed from each of these oranges is approximately normally distributed with a mean of 70 millilitres and a standard deviation of 8 millilitres.What is the probability a randomly selected orange will contain

a)between 62 and 73 millilitres
b)between 72 and 78 millilitres
c)75% of the orange will contain at least how many millilitres of juice